The release of the Blackphone caused a stir last month when much of the press claimed it to be ‘NSA proof’, despite the creators not making such a blatant claim.

But the smartphone’s use of Silent Circle’s security-enhanced apps has come under fire from mobile collaboration provider Accellion.

"If enterprises are serious about mobile security they need to provide employees with their own, approved enterprise-class applications that are both trustworthy and secure to aid employee productivity," says Jes Breslaw, director of cloud solutions at Accellion.

"Too often we see employee dependency on consumer applications at the root of security vulnerabilities within organisations. Rather than throw the baby out with the bath water and replacing the hardware these employees use, why not nip the issue in the bud by standardising the software that employees are allowed to use?"

Breslaw’s criticisms were not exclusive to the Blackphone, as he said that no phone will ever be completely secure as you cannot control user behaviour.

"In addition to focusing on securing the device, it is just as important to secure the content itself, which allows the user to operate freely and securely from any device."